音響センサを用いたケーシングパイプ内の砂面位置計測 Measurement of Sand Level in Casing Pipe Using Acoustic Sensor

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In civil engineering, to improve weak foundations, many sand pillars are struck into the grounds using a casing pipe. If the sinking velocity of the sand level in the pipe is measured on-line accurately, a smooth construction can be then achieved. The measurement is reduced to that of a length of the air pillar in the pipe. The authors thus proposed a highly accurate pipe length measurement system, which applied a bank of Kalman filters to a linear dynamic model of the stationary wave generating in the pipe. Although the method realized an accurate on-line measurement of the error rate 0.01_??_0.08%, it was applied only on a stand-still steel pipe.<br>This paper thus tries to apply the system to the measurement of the actual sand level in a casing pipe. This application encounters, however, two new problems. One is that an electric signal caused by the vibration of the casing pipe superposes to that of the stationary wave in the pipe. The other is that the lengths of the air pillar measured with low and high order modes models are different because of the complicated structure of the pipe.<br>The paper presents a practical measurement system which overcomes the two problems and realizes an accurate on-line sand level measurement in the pipe.

収録刊行物

  • 電気学会論文誌. D, 産業応用部門誌 = The transactions of the Institute of Electrical Engineers of Japan. D, A publication of Industry Applications Society  

    電気学会論文誌. D, 産業応用部門誌 = The transactions of the Institute of Electrical Engineers of Japan. D, A publication of Industry Applications Society 118(12), 1394-1402, 1998-12-01 

    The Institute of Electrical Engineers of Japan

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各種コード

  • NII論文ID(NAID)
    10002727618
  • NII書誌ID(NCID)
    AN10012320
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    09136339
  • NDL 記事登録ID
    4612070
  • NDL 雑誌分類
    ZN31(科学技術--電気工学・電気機械工業)
  • NDL 請求記号
    Z16-1608
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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